片状羰基铁聚酯纤维增强复合材料制备及吸波性能研究OA

Flake carbonyl iron powder(CIP)is a typical magnetic-loss electromagnetic wave absorber,but its high density limits practical application.In this study,CIP was compounded with waterborne polyurethane(PU)and polyester fiber(PET)to prepare CIP/PET/PU composites,and their performance was systematically investigated.Two CIP sizes were each dispersed at different mass ratios into PU solutions to form impregnation solutions,into which PET fibers were subsequently immersed to yield CIP/PET/PU.Characterization of the microstructure,microwave ab-sorption properties,and mechanical performance revealed distinct differences between the front and back sides of the composite.The cross-section exhibited a gradient distribution of CIP,transitioning from a dense concentration at the back side to a sparse distribution at the front side,with larger CIP particles being more prone to forming a dense struc-ture on the back side.The microwave absorption performance of the back side was significantly superior to that of the front side.For composites containing larger CIP at a mass ratio of m(CIP)∶m(PU)=1.5,the minimum reflection loss reached-25 dB at 18 GHz.Effective absorption was still achieved at a low mass ratio of m(CIP)∶m(PU)=0.15,indi-cating promising potential for lightweight composites.Regarding mechanical properties,composites with smaller CIP at m(CIP)∶m(PU)=0.015 showed mechanical performance slightly higher than or comparable to that of the CIP-free composite.Similarly,composites with larger CIP at m(CIP)∶m(PU)=1.5 exhibited slightly better mechanical properties than the CIP-free composite.However,all other samples showed inferior mechanical performance compared with the CIP-free composite.